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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08e95ab2dac19d1fec1ec324117d42a1eccfa4a83da8971e6701c28d47f929a1' 
  AND token = 'ZmyJJkbyP7PDKDAo51+xY3LMyRI2gMViuWqIoAlkZgE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}